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From: jel@psuvm.bitnet.UUCP
Newsgroups: sci.electronics
Subject: Re: Question about multi-switched lights
Message-ID: <11772JEL@PSUVM>
Date: Sat, 28-Mar-87 12:13:37 EST
Article-I.D.: PSUVM.11772JEL
Posted: Sat Mar 28 12:13:37 1987
Date-Received: Thu, 9-Apr-87 03:19:39 EST
References: <1922@ihlpl.ATT.COM> <562@puff.WISC.EDU> <3972@fritz.UUCP> <18002@ucbvax.BERKELEY.EDU> 860@riccb.UUCP
Organization: The Pennsylvania State University - Computation Center
Lines: 36

In article <860@riccb.UUCP>, jmc@riccb.UUCP (Jeff McQuinn ) says:
>                             S1-a            S2-b
>        Tip >----------------o/ o------------o--o--------------> Tip to Phone
>                     |                                  |
>                     |       S1-b            S2-a       |
>                     --------o--o------------o/ o--------
>
>
>       Ring >--------------------------------------------------> Ring to Phone
>
>                      S1-a = Normally open contact of a 2PST switch
>                      S1-b = Normally closed contact of S1
>
>                      S2-a = Normally open contact of a 2PST switch
>                      S2-b = Normally closed contact of S2
>
>                  (These are the ON-ON type of switches with 3 terminals)
>
>               This scheme allows the phone to ring but cannot close the loop
>               to answer.  If you don't want it to ring either, simply put the
>               switches on the Ring lead instead of the Tip lead.
>
>                                          Jeff McQuinn just VAXing around
     
Really??  I've never heard of a device that could start to ring with only
one line going into it...  Is there some sort of a ground involved?  How
would one ground a phone?  All 7 of the phones in our apt aren't grounded.
Wouldn't the phone company get upset if one did this (ground the phone)?
     
And finally a question to the original poster:  Why ARE you trying to do this??
     
- Jon
     
Stolen from some comedian:  "I work for the Bell System...     Taco Bell."
     
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